I have no idea why some people say that but it is a pervasive myth. It's simply not true. I highly doubt that other people's detergent would ruin anything. The most likely issue is that they simply are not clean. Multiple rinses and baking soda will not kill bacteria. Especially in something like an AIO that has several layers. The ammonia means bacteria. I really think that using a better and stronger detergent with occasional bleaching will solve your problem. Unfortunately neither of those detergents have a very good track record for a lot of people.